General Diagnosis - Isuzu 1999 RODEO Workshop Manual

General Diagnosis

Condition
Brake Pull
Brake Roughness or
(Pulsates)
Excessive Pedal Effort
Possible cause
Tire inflation pressure is unequal.
Front wheel alignment is incorrect.
Unmatched tires on same axle.
Restricted brake pipes or hoses.
Water or oil on the brake pads.
Brake pads hardened.
Brake pads worn excessively.
Brake rotor worn or scored.
Disc brake caliper malfunctioning.
Front hub bearing preload incorrect.
Loose suspension parts.
Loose calipers.
Chatter Excessive lateral runout.
Parallelism not within specifications.
Wheel bearings not adjusted.
Pad reversed (steel against iron).
Malfunctioning vacuum booster.
Partial system failure.
Excessively worn pad.
Piston in caliper stuck or sluggish.
Fading brakes due to incorrect pad.
Vacuum leak to vacuum booster.
Check the direction of check valve
within vacuum hose.
Grease on the brake pads.
POWER–ASSISTED BRAKE SYSTEM
Adjust
Adjust
Tires with approx. the same amount
of tread should be used on the same
axle.
Check for soft hoses and damaged
lines. Replace with new hoses and
new double"walled steel brake
piping.
Clean or replace.
Replace
Replace
Grind or replace.
Clean or replace.
Adjust or replace.
Check all suspension mountings.
Check and tighten the bolts to
specifications.
Check per instructions. If not within
specifications, replace or machine
the rotor.
Check per instructions. If not within
specifications, replace or machine
the rotor.
Adjust wheel bearings to correct
specifications
Replace the brake pad and machine
rotor to within specifications.
Check the vacuum booster operation
and repair, if necessary.
Check the front and rear brake
system for failure and repair. Also,
check the brake warning light. If a
failed system is found, the light
should indicate failure.
Check and replace pads in sets.
Remove caliper and rebuild.
Remove and replace with original
equipment pad or equivalent.
Check for ruptured or loose hose.
Correct vacuum hose direction.
Replace or clean.
5C–7
Correction